更新 tree2 截图，首页添加地图工具链接
diff --git a/doc/asset/img/example/tree2.png b/doc/asset/img/example/tree2.png
index 36ba35d..ac2d745 100644
--- a/doc/asset/img/example/tree2.png
+++ b/doc/asset/img/example/tree2.png
Binary files differ
diff --git a/doc/asset/js/echartsHome.js b/doc/asset/js/echartsHome.js
index e2d4873..61f2f67 100644
--- a/doc/asset/js/echartsHome.js
+++ b/doc/asset/js/echartsHome.js
@@ -92,6 +92,7 @@
+ '<a href="#" class="dropdown-toggle" data-toggle="dropdown">' + (enVersion ? 'Download' : '下载') + '<b class="caret"></b></a>'
+ '<ul class="dropdown-menu">'
+ '<li><a href="http://ecomfe.github.io/echarts-builder-web/">' + (enVersion ? 'Online builder' : '在线构建工具') + '</a></li>'
+ + '<li><a href="http://ecomfe.github.io/echarts-map-tool/">' + (enVersion ? 'Map tool' : '地图数据生成工具') + '</a></li>'
+ '<li class="divider"></li>'
+ '<li><a href="http://echarts.baidu.com/build/echarts-' + version + '.zip"> echarts-' + version + ' (from Baidu)</a></li>'
+ '<li><a href="https://github.com/ecomfe/echarts/archive/' + version + '.zip"> echarts-' + version + ' (from GitHub)</a></li>'
